The grooved ventilator for plain tiles is used to ventilate the roof. It allows fresh air to flow in, which flows up behind the covering so that moisture can be removed. Due to its inconspicuous shape, the grooved fan can be inserted discreetly into the roof surface. However, in order for it to ensure optimal ventilation of the roof covering, a complete row of roof surface must be laid with it. The grooved fan is available for our Berliner Biber, our South German Biber and for special cuts in the 18 format.